PySide2 Custom QDialog

Create QDialog UI

• New file or project (Ctrl + N)->Qt->Qt Designer Form-> Dialog without Buttons
• Add okPushButton and cancelPushButton

Example

settings_dialog.py

import copy

from PySide2.QtCore import Qt
from PySide2.QtWidgets import QDialog

from ui_settings_dialog import Ui_SettingsDialog


class SettingsDialog(QDialog, Ui_SettingsDialog):
    def __init__(self, parent=None) -> None:
        super().__init__(parent=parent)
        self.setupUi(self)
        self.setModal(True)
        self.setWindowFlag(Qt.FramelessWindowHint)

        # When accepted, self.result() is 1.
        self.okPushButton.clicked.connect(self.accept)
        # When rejected, self.result() is 0.
        self.cancelPushButton.clicked.connect(self.reject)

        self._settings = None

    def setSettings(self, settings):
        # Copies settings. Do not edit settings.
        self._settings = copy.deepcopy(settings)

    def getSettings(self):
        return self._settings

main_window.py

import sys

from PySide2.QtWidgets import QMainWindow, QApplication

from ui_main_window import Ui_MainWindow
from settings_dialog import SettingsDialog


class MainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)

        ...

        self.settingsDialog = SettingsDialog(self)
        self.settingsDialog.finished.connect(self.finishedSettingsDialog)

        self.settingsPushButton.clicked.connect(self.openSettingsDialog)

    def openSettingsDialog(self):
        self.settingsDialog.setSettings(self.settings)
        self.settingsDialog.open()

    def finishedSettingsDialog(self):
        if self.settingsDialog.result():
            self.settings = self.settingsDialog.getSettings()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainWindow = MainWindow()
    mainWindow.show()
    sys.exit(app.exec_())